| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved. |
| * |
| * This work was based on the 2.4/2.6 kernel development by Dick Reigner. |
| * Work to add BIOS PROM support was completed by Mike Habeck. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/pci_hotplug.h> |
| #include <linux/proc_fs.h> |
| #include <linux/types.h> |
| #include <linux/mutex.h> |
| |
| #include <asm/sn/addrs.h> |
| #include <asm/sn/geo.h> |
| #include <asm/sn/l1.h> |
| #include <asm/sn/module.h> |
| #include <asm/sn/pcibr_provider.h> |
| #include <asm/sn/pcibus_provider_defs.h> |
| #include <asm/sn/pcidev.h> |
| #include <asm/sn/sn_feature_sets.h> |
| #include <asm/sn/sn_sal.h> |
| #include <asm/sn/types.h> |
| #include <linux/acpi.h> |
| #include <asm/sn/acpi.h> |
| |
| #include "../pci.h" |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)"); |
| MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver"); |
| |
| |
| /* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */ |
| #define PCI_SLOT_ALREADY_UP 2 /* slot already up */ |
| #define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */ |
| #define PCI_L1_ERR 7 /* L1 console command error */ |
| #define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */ |
| |
| |
| #define PCIIO_ASIC_TYPE_TIOCA 4 |
| #define PCI_L1_QSIZE 128 /* our L1 message buffer size */ |
| #define SN_MAX_HP_SLOTS 32 /* max hotplug slots */ |
| #define SN_SLOT_NAME_SIZE 33 /* size of name string */ |
| |
| /* internal list head */ |
| static struct list_head sn_hp_list; |
| |
| /* hotplug_slot struct's private pointer */ |
| struct slot { |
| int device_num; |
| struct pci_bus *pci_bus; |
| /* this struct for glue internal only */ |
| struct hotplug_slot *hotplug_slot; |
| struct list_head hp_list; |
| char physical_path[SN_SLOT_NAME_SIZE]; |
| }; |
| |
| struct pcibr_slot_enable_resp { |
| int resp_sub_errno; |
| char resp_l1_msg[PCI_L1_QSIZE + 1]; |
| }; |
| |
| struct pcibr_slot_disable_resp { |
| int resp_sub_errno; |
| char resp_l1_msg[PCI_L1_QSIZE + 1]; |
| }; |
| |
| enum sn_pci_req_e { |
| PCI_REQ_SLOT_ELIGIBLE, |
| PCI_REQ_SLOT_DISABLE |
| }; |
| |
| static int enable_slot(struct hotplug_slot *slot); |
| static int disable_slot(struct hotplug_slot *slot); |
| static inline int get_power_status(struct hotplug_slot *slot, u8 *value); |
| |
| static struct hotplug_slot_ops sn_hotplug_slot_ops = { |
| .owner = THIS_MODULE, |
| .enable_slot = enable_slot, |
| .disable_slot = disable_slot, |
| .get_power_status = get_power_status, |
| }; |
| |
| static DEFINE_MUTEX(sn_hotplug_mutex); |
| |
| static ssize_t path_show (struct hotplug_slot *bss_hotplug_slot, |
| char *buf) |
| { |
| int retval = -ENOENT; |
| struct slot *slot = bss_hotplug_slot->private; |
| |
| if (!slot) |
| return retval; |
| |
| retval = sprintf (buf, "%s\n", slot->physical_path); |
| return retval; |
| } |
| |
| static struct hotplug_slot_attribute sn_slot_path_attr = __ATTR_RO(path); |
| |
| static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device) |
| { |
| struct pcibus_info *pcibus_info; |
| u16 busnum, segment, ioboard_type; |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus); |
| |
| /* Check to see if this is a valid slot on 'pci_bus' */ |
| if (!(pcibus_info->pbi_valid_devices & (1 << device))) |
| return -EPERM; |
| |
| ioboard_type = sn_ioboard_to_pci_bus(pci_bus); |
| busnum = pcibus_info->pbi_buscommon.bs_persist_busnum; |
| segment = pci_domain_nr(pci_bus) & 0xf; |
| |
| /* Do not allow hotplug operations on base I/O cards */ |
| if ((ioboard_type == L1_BRICKTYPE_IX || |
| ioboard_type == L1_BRICKTYPE_IA) && |
| (segment == 1 && busnum == 0 && device != 1)) |
| return -EPERM; |
| |
| return 1; |
| } |
| |
| static int sn_pci_bus_valid(struct pci_bus *pci_bus) |
| { |
| struct pcibus_info *pcibus_info; |
| u32 asic_type; |
| u16 ioboard_type; |
| |
| /* Don't register slots hanging off the TIOCA bus */ |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus); |
| asic_type = pcibus_info->pbi_buscommon.bs_asic_type; |
| if (asic_type == PCIIO_ASIC_TYPE_TIOCA) |
| return -EPERM; |
| |
| /* Only register slots in I/O Bricks that support hotplug */ |
| ioboard_type = sn_ioboard_to_pci_bus(pci_bus); |
| switch (ioboard_type) { |
| case L1_BRICKTYPE_IX: |
| case L1_BRICKTYPE_PX: |
| case L1_BRICKTYPE_IA: |
| case L1_BRICKTYPE_PA: |
| case L1_BOARDTYPE_PCIX3SLOT: |
| return 1; |
| break; |
| default: |
| return -EPERM; |
| break; |
| } |
| |
| return -EIO; |
| } |
| |
| static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot, |
| struct pci_bus *pci_bus, int device, |
| char *name) |
| { |
| struct pcibus_info *pcibus_info; |
| struct slot *slot; |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus); |
| |
| slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
| if (!slot) |
| return -ENOMEM; |
| bss_hotplug_slot->private = slot; |
| |
| slot->device_num = device; |
| slot->pci_bus = pci_bus; |
| sprintf(name, "%04x:%02x:%02x", |
| pci_domain_nr(pci_bus), |
| ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum), |
| device + 1); |
| |
| sn_generate_path(pci_bus, slot->physical_path); |
| |
| slot->hotplug_slot = bss_hotplug_slot; |
| list_add(&slot->hp_list, &sn_hp_list); |
| |
| return 0; |
| } |
| |
| static struct hotplug_slot * sn_hp_destroy(void) |
| { |
| struct slot *slot; |
| struct pci_slot *pci_slot; |
| struct hotplug_slot *bss_hotplug_slot = NULL; |
| |
| list_for_each_entry(slot, &sn_hp_list, hp_list) { |
| bss_hotplug_slot = slot->hotplug_slot; |
| pci_slot = bss_hotplug_slot->pci_slot; |
| list_del(&((struct slot *)bss_hotplug_slot->private)-> |
| hp_list); |
| sysfs_remove_file(&pci_slot->kobj, |
| &sn_slot_path_attr.attr); |
| break; |
| } |
| return bss_hotplug_slot; |
| } |
| |
| static void sn_bus_free_data(struct pci_dev *dev) |
| { |
| struct pci_bus *subordinate_bus; |
| struct pci_dev *child; |
| |
| /* Recursively clean up sn_irq_info structs */ |
| if (dev->subordinate) { |
| subordinate_bus = dev->subordinate; |
| list_for_each_entry(child, &subordinate_bus->devices, bus_list) |
| sn_bus_free_data(child); |
| } |
| /* |
| * Some drivers may use dma accesses during the |
| * driver remove function. We release the sysdata |
| * areas after the driver remove functions have |
| * been called. |
| */ |
| sn_bus_store_sysdata(dev); |
| sn_pci_unfixup_slot(dev); |
| } |
| |
| static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot, |
| int device_num, char **ssdt) |
| { |
| struct slot *slot = bss_hotplug_slot->private; |
| struct pcibus_info *pcibus_info; |
| struct pcibr_slot_enable_resp resp; |
| int rc; |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus); |
| |
| /* |
| * Power-on and initialize the slot in the SN |
| * PCI infrastructure. |
| */ |
| rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt); |
| |
| |
| if (rc == PCI_SLOT_ALREADY_UP) { |
| dev_dbg(&slot->pci_bus->self->dev, "is already active\n"); |
| return 1; /* return 1 to user */ |
| } |
| |
| if (rc == PCI_L1_ERR) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "L1 failure %d with message: %s", |
| resp.resp_sub_errno, resp.resp_l1_msg); |
| return -EPERM; |
| } |
| |
| if (rc) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "insert failed with error %d sub-error %d\n", |
| rc, resp.resp_sub_errno); |
| return -EIO; |
| } |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus); |
| pcibus_info->pbi_enabled_devices |= (1 << device_num); |
| |
| return 0; |
| } |
| |
| static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot, |
| int device_num, int action) |
| { |
| struct slot *slot = bss_hotplug_slot->private; |
| struct pcibus_info *pcibus_info; |
| struct pcibr_slot_disable_resp resp; |
| int rc; |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus); |
| |
| rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp); |
| |
| if ((action == PCI_REQ_SLOT_ELIGIBLE) && |
| (rc == PCI_SLOT_ALREADY_DOWN)) { |
| dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path); |
| return 1; /* return 1 to user */ |
| } |
| |
| if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "Cannot remove last 33MHz card\n"); |
| return -EPERM; |
| } |
| |
| if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "L1 failure %d with message \n%s\n", |
| resp.resp_sub_errno, resp.resp_l1_msg); |
| return -EPERM; |
| } |
| |
| if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "remove failed with error %d sub-error %d\n", |
| rc, resp.resp_sub_errno); |
| return -EIO; |
| } |
| |
| if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc) |
| return 0; |
| |
| if ((action == PCI_REQ_SLOT_DISABLE) && !rc) { |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus); |
| pcibus_info->pbi_enabled_devices &= ~(1 << device_num); |
| dev_dbg(&slot->pci_bus->self->dev, "remove successful\n"); |
| return 0; |
| } |
| |
| if ((action == PCI_REQ_SLOT_DISABLE) && rc) { |
| dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc); |
| } |
| |
| return rc; |
| } |
| |
| /* |
| * Power up and configure the slot via a SAL call to PROM. |
| * Scan slot (and any children), do any platform specific fixup, |
| * and find device driver. |
| */ |
| static int enable_slot(struct hotplug_slot *bss_hotplug_slot) |
| { |
| struct slot *slot = bss_hotplug_slot->private; |
| struct pci_bus *new_bus = NULL; |
| struct pci_dev *dev; |
| int func, num_funcs; |
| int new_ppb = 0; |
| int rc; |
| char *ssdt = NULL; |
| void pcibios_fixup_device_resources(struct pci_dev *); |
| |
| /* Serialize the Linux PCI infrastructure */ |
| mutex_lock(&sn_hotplug_mutex); |
| |
| /* |
| * Power-on and initialize the slot in the SN |
| * PCI infrastructure. Also, retrieve the ACPI SSDT |
| * table for the slot (if ACPI capable PROM). |
| */ |
| rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt); |
| if (rc) { |
| mutex_unlock(&sn_hotplug_mutex); |
| return rc; |
| } |
| |
| if (ssdt) |
| ssdt = __va(ssdt); |
| /* Add the new SSDT for the slot to the ACPI namespace */ |
| if (SN_ACPI_BASE_SUPPORT() && ssdt) { |
| acpi_status ret; |
| |
| ret = acpi_load_table((struct acpi_table_header *)ssdt); |
| if (ACPI_FAILURE(ret)) { |
| printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n", |
| __func__, ret); |
| /* try to continue on */ |
| } |
| } |
| |
| num_funcs = pci_scan_slot(slot->pci_bus, |
| PCI_DEVFN(slot->device_num + 1, 0)); |
| if (!num_funcs) { |
| dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n"); |
| mutex_unlock(&sn_hotplug_mutex); |
| return -ENODEV; |
| } |
| |
| /* |
| * Map SN resources for all functions on the card |
| * to the Linux PCI interface and tell the drivers |
| * about them. |
| */ |
| for (func = 0; func < num_funcs; func++) { |
| dev = pci_get_slot(slot->pci_bus, |
| PCI_DEVFN(slot->device_num + 1, |
| PCI_FUNC(func))); |
| if (dev) { |
| /* Need to do slot fixup on PPB before fixup of children |
| * (PPB's pcidev_info needs to be in pcidev_info list |
| * before child's SN_PCIDEV_INFO() call to setup |
| * pdi_host_pcidev_info). |
| */ |
| pcibios_fixup_device_resources(dev); |
| if (SN_ACPI_BASE_SUPPORT()) |
| sn_acpi_slot_fixup(dev); |
| else |
| sn_io_slot_fixup(dev); |
| if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { |
| unsigned char sec_bus; |
| pci_read_config_byte(dev, PCI_SECONDARY_BUS, |
| &sec_bus); |
| new_bus = pci_add_new_bus(dev->bus, dev, |
| sec_bus); |
| pci_scan_child_bus(new_bus); |
| new_ppb = 1; |
| } |
| pci_dev_put(dev); |
| } |
| } |
| |
| /* |
| * Add the slot's devices to the ACPI infrastructure */ |
| if (SN_ACPI_BASE_SUPPORT() && ssdt) { |
| unsigned long long adr; |
| struct acpi_device *pdevice; |
| struct acpi_device *device; |
| acpi_handle phandle; |
| acpi_handle chandle = NULL; |
| acpi_handle rethandle; |
| acpi_status ret; |
| |
| phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle; |
| |
| if (acpi_bus_get_device(phandle, &pdevice)) { |
| dev_dbg(&slot->pci_bus->self->dev, |
| "no parent device, assuming NULL\n"); |
| pdevice = NULL; |
| } |
| |
| /* |
| * Walk the rootbus node's immediate children looking for |
| * the slot's device node(s). There can be more than |
| * one for multifunction devices. |
| */ |
| for (;;) { |
| rethandle = NULL; |
| ret = acpi_get_next_object(ACPI_TYPE_DEVICE, |
| phandle, chandle, |
| &rethandle); |
| |
| if (ret == AE_NOT_FOUND || rethandle == NULL) |
| break; |
| |
| chandle = rethandle; |
| |
| ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR, |
| NULL, &adr); |
| |
| if (ACPI_SUCCESS(ret) && |
| (adr>>16) == (slot->device_num + 1)) { |
| |
| ret = acpi_bus_add(&device, pdevice, chandle, |
| ACPI_BUS_TYPE_DEVICE); |
| if (ACPI_FAILURE(ret)) { |
| printk(KERN_ERR "%s: acpi_bus_add " |
| "failed (0x%x) for slot %d " |
| "func %d\n", __func__, |
| ret, (int)(adr>>16), |
| (int)(adr&0xffff)); |
| /* try to continue on */ |
| } else { |
| acpi_bus_start(device); |
| } |
| } |
| } |
| } |
| |
| /* Call the driver for the new device */ |
| pci_bus_add_devices(slot->pci_bus); |
| /* Call the drivers for the new devices subordinate to PPB */ |
| if (new_ppb) |
| pci_bus_add_devices(new_bus); |
| |
| mutex_unlock(&sn_hotplug_mutex); |
| |
| if (rc == 0) |
| dev_dbg(&slot->pci_bus->self->dev, |
| "insert operation successful\n"); |
| else |
| dev_dbg(&slot->pci_bus->self->dev, |
| "insert operation failed rc = %d\n", rc); |
| |
| return rc; |
| } |
| |
| static int disable_slot(struct hotplug_slot *bss_hotplug_slot) |
| { |
| struct slot *slot = bss_hotplug_slot->private; |
| struct pci_dev *dev; |
| int func; |
| int rc; |
| acpi_owner_id ssdt_id = 0; |
| |
| /* Acquire update access to the bus */ |
| mutex_lock(&sn_hotplug_mutex); |
| |
| /* is it okay to bring this slot down? */ |
| rc = sn_slot_disable(bss_hotplug_slot, slot->device_num, |
| PCI_REQ_SLOT_ELIGIBLE); |
| if (rc) |
| goto leaving; |
| |
| /* free the ACPI resources for the slot */ |
| if (SN_ACPI_BASE_SUPPORT() && |
| PCI_CONTROLLER(slot->pci_bus)->acpi_handle) { |
| unsigned long long adr; |
| struct acpi_device *device; |
| acpi_handle phandle; |
| acpi_handle chandle = NULL; |
| acpi_handle rethandle; |
| acpi_status ret; |
| |
| /* Get the rootbus node pointer */ |
| phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle; |
| |
| /* |
| * Walk the rootbus node's immediate children looking for |
| * the slot's device node(s). There can be more than |
| * one for multifunction devices. |
| */ |
| for (;;) { |
| rethandle = NULL; |
| ret = acpi_get_next_object(ACPI_TYPE_DEVICE, |
| phandle, chandle, |
| &rethandle); |
| |
| if (ret == AE_NOT_FOUND || rethandle == NULL) |
| break; |
| |
| chandle = rethandle; |
| |
| ret = acpi_evaluate_integer(chandle, |
| METHOD_NAME__ADR, |
| NULL, &adr); |
| if (ACPI_SUCCESS(ret) && |
| (adr>>16) == (slot->device_num + 1)) { |
| /* retain the owner id */ |
| acpi_get_id(chandle, &ssdt_id); |
| |
| ret = acpi_bus_get_device(chandle, |
| &device); |
| if (ACPI_SUCCESS(ret)) |
| acpi_bus_trim(device, 1); |
| } |
| } |
| |
| } |
| |
| /* Free the SN resources assigned to the Linux device.*/ |
| for (func = 0; func < 8; func++) { |
| dev = pci_get_slot(slot->pci_bus, |
| PCI_DEVFN(slot->device_num + 1, |
| PCI_FUNC(func))); |
| if (dev) { |
| sn_bus_free_data(dev); |
| pci_remove_bus_device(dev); |
| pci_dev_put(dev); |
| } |
| } |
| |
| /* Remove the SSDT for the slot from the ACPI namespace */ |
| if (SN_ACPI_BASE_SUPPORT() && ssdt_id) { |
| acpi_status ret; |
| ret = acpi_unload_table_id(ssdt_id); |
| if (ACPI_FAILURE(ret)) { |
| printk(KERN_ERR "%s: acpi_unload_table_id " |
| "failed (0x%x) for id %d\n", |
| __func__, ret, ssdt_id); |
| /* try to continue on */ |
| } |
| } |
| |
| /* free the collected sysdata pointers */ |
| sn_bus_free_sysdata(); |
| |
| /* Deactivate slot */ |
| rc = sn_slot_disable(bss_hotplug_slot, slot->device_num, |
| PCI_REQ_SLOT_DISABLE); |
| leaving: |
| /* Release the bus lock */ |
| mutex_unlock(&sn_hotplug_mutex); |
| |
| return rc; |
| } |
| |
| static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot, |
| u8 *value) |
| { |
| struct slot *slot = bss_hotplug_slot->private; |
| struct pcibus_info *pcibus_info; |
| u32 power; |
| |
| pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus); |
| mutex_lock(&sn_hotplug_mutex); |
| power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num); |
| *value = power ? 1 : 0; |
| mutex_unlock(&sn_hotplug_mutex); |
| return 0; |
| } |
| |
| static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot) |
| { |
| kfree(bss_hotplug_slot->info); |
| kfree(bss_hotplug_slot->private); |
| kfree(bss_hotplug_slot); |
| } |
| |
| static int sn_hotplug_slot_register(struct pci_bus *pci_bus) |
| { |
| int device; |
| struct pci_slot *pci_slot; |
| struct hotplug_slot *bss_hotplug_slot; |
| char name[SN_SLOT_NAME_SIZE]; |
| int rc = 0; |
| |
| /* |
| * Currently only four devices are supported, |
| * in the future there maybe more -- up to 32. |
| */ |
| |
| for (device = 0; device < SN_MAX_HP_SLOTS ; device++) { |
| if (sn_pci_slot_valid(pci_bus, device) != 1) |
| continue; |
| |
| bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot), |
| GFP_KERNEL); |
| if (!bss_hotplug_slot) { |
| rc = -ENOMEM; |
| goto alloc_err; |
| } |
| |
| bss_hotplug_slot->info = |
| kzalloc(sizeof(struct hotplug_slot_info), |
| GFP_KERNEL); |
| if (!bss_hotplug_slot->info) { |
| rc = -ENOMEM; |
| goto alloc_err; |
| } |
| |
| if (sn_hp_slot_private_alloc(bss_hotplug_slot, |
| pci_bus, device, name)) { |
| rc = -ENOMEM; |
| goto alloc_err; |
| } |
| bss_hotplug_slot->ops = &sn_hotplug_slot_ops; |
| bss_hotplug_slot->release = &sn_release_slot; |
| |
| rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name); |
| if (rc) |
| goto register_err; |
| |
| pci_slot = bss_hotplug_slot->pci_slot; |
| rc = sysfs_create_file(&pci_slot->kobj, |
| &sn_slot_path_attr.attr); |
| if (rc) |
| goto register_err; |
| } |
| dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n"); |
| return rc; |
| |
| register_err: |
| dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n", |
| rc); |
| |
| alloc_err: |
| if (rc == -ENOMEM) |
| dev_dbg(&pci_bus->self->dev, "Memory allocation error\n"); |
| |
| /* destroy THIS element */ |
| if (bss_hotplug_slot) |
| sn_release_slot(bss_hotplug_slot); |
| |
| /* destroy anything else on the list */ |
| while ((bss_hotplug_slot = sn_hp_destroy())) |
| pci_hp_deregister(bss_hotplug_slot); |
| |
| return rc; |
| } |
| |
| static int __init sn_pci_hotplug_init(void) |
| { |
| struct pci_bus *pci_bus = NULL; |
| int rc; |
| int registered = 0; |
| |
| if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) { |
| printk(KERN_ERR "%s: PROM version does not support hotplug.\n", |
| __func__); |
| return -EPERM; |
| } |
| |
| INIT_LIST_HEAD(&sn_hp_list); |
| |
| while ((pci_bus = pci_find_next_bus(pci_bus))) { |
| if (!pci_bus->sysdata) |
| continue; |
| |
| rc = sn_pci_bus_valid(pci_bus); |
| if (rc != 1) { |
| dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n"); |
| continue; |
| } |
| dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n"); |
| |
| rc = sn_hotplug_slot_register(pci_bus); |
| if (!rc) { |
| registered = 1; |
| } else { |
| registered = 0; |
| break; |
| } |
| } |
| |
| return registered == 1 ? 0 : -ENODEV; |
| } |
| |
| static void __exit sn_pci_hotplug_exit(void) |
| { |
| struct hotplug_slot *bss_hotplug_slot; |
| |
| while ((bss_hotplug_slot = sn_hp_destroy())) |
| pci_hp_deregister(bss_hotplug_slot); |
| |
| if (!list_empty(&sn_hp_list)) |
| printk(KERN_ERR "%s: internal list is not empty\n", __FILE__); |
| } |
| |
| module_init(sn_pci_hotplug_init); |
| module_exit(sn_pci_hotplug_exit); |